Geobios

The camerate crinoids Hexacrinites hieroglyphicus (Goldfuss, 1839) and H. marginatus (Schultze, 1866) are valid species known from the Lower Givetian of the synclines of Gerolstein and Hillesheim, Eifel Hills (westernmost Germany). As shown by the refigured holotypes and new material, they are mostly separated by the expressed ornamentation of radials and basals. The radials of H. hieroglyphicus are characterized by prominent, variously formed bulges, stretching preferably in a radiate pattern across most of the plates. They do not reach the low plate boundaries. Vice versa, H. marginatus shows expressed depressions in the central part of the plates, but raised plate margins. The first known crowns of H. marginatus are described; one of them is proposed as neotype for the lost original.RésuméLes crinoïdes Camerata Hexacrinites hieroglyphicus (Goldfuss, 1839) et H. marginatus (Schultze, 1866) sont des espèces valides, connues dans le Givétien inférieur des synclinaux de Gerolstein et de Hillesheim dans l’Eifel (ouest de l’Allemagne). Comme le montrent les holotypes refigurés et le nouveau matériel, elles sont séparées essentiellement sur l’ornementation bien exprimée sur les plaques radiales et basales. Les radiales de H. hieroglyphicus sont caractérisées par des bourrelets proéminents, de forme variée, disposés suivant un motif radiaire et recouvrant la quasi-totalité des plaques. Ils n’atteignent pas les sutures inférieures des plaques. De son côté, H. marginatus montre des dépressions bien exprimées dans la partie centrale des plaques mais avec la marge des plaques relevées. Les premières couronnes de H. marginatus sont décrites ; l’une d’elle est proposée comme néotype en remplacement de l’original disparu.

The Lower Devonian genus VlastaBarrande, 1881 (Vlastinae, Antipleuridae) represents the oldest known bivalve with a sinistrally twisted shell, that relates to a shallow endobyssate mode of life in unstable biodetrital sediment. Detailed study shows that the shells lacked the gapes described by Barrande in the last century. The subfamily Vlastinae, originally established for Lower Paleozoic Bivalvia having large shell gapes, cannot include the genera ShaninaReed, 1924 and ShaninopsisIsberg, 1934. Vlasta occurs in Bohemia, Morocco and probably in Central Asia as a single, highly variable species, Vlasta bohemicaBarrande, 1881.RésuméLe bivalve VlastaBarrande, 1881 (Vlastinae, Antipleuridae) du Dévonien inférieur est la plus ancienneforme connue avec une coquille senestre, liée à un mode de vie dans le sédiment biodétritique instable d'une mer peu profonde. L'étude détaillée révèle que les coquilles n'avaient pas les bâillements décrits par Barrande au siècle dernier. La sous-famille Vlastinae, originellement établie pour les bivalves du Paléozoique inférieur avec de larges baîllements de la coquille, ne comprend pas les genres ShaninaReed, 1924 et ShaninopsisIsberg, 1934. Vlasta est représenté en Bohême, au Maroc et probablement en Asie centrale par une seule espèce à grande variabilité, Vlasta bohemicaBarrande, 1881.

Lower Bajocian (Propinquans and Humphriesianum zones) reef-building corals of France are rather poorlydiversified: 16 to 19 genera (including morphogenera) and 17 to 26 species. The new genus Atelophyllia is created and the poorly known genus Ebrayia is revised. Synonymies of species are well understood, owing to a statistical analysis of populations sampled in the field (1410 samples, 900 thin sections). The taxonomic list and statistics offer the first paleoecological tool to study the trends of diversity. Because this diversity increases southwards (South Jura, Mâconnais), it suggests that a climatic control underlies the diversity gradient. Functional morphologic analysis of the various taxa offers a second method to evaluate ancient light intensities and sedimentation rates. For instance, a comparison with Montastrea, a recent zooxanthellate coral, shows that the variations of the colonial shape of Isastrea are light-dependant. An interpretation of Bajocian bioherms as lithoherms built by nonzooxanthellate corals must be rejected. The average annual growth rates of Bajocian corals are very low. The new findings suggest evolutionary and climatic explanations.

New material from the Lower Paleocene of the Oulad Abdoun Basin, Morocco, including postcranial material permits a new description of Argochampsa krebsi. The odontoid process of the axis bears a strong lateral apophysis, continuous on the anterolateral margin of the centrum. This process has never been observed such developed in other crocodylians. The single preserved posterior cervical vertebra exhibits a particularly short neural spine, much shorter than that is observed in Alligator mississippiensis, Crocodylus porosus, and Gavialis gangeticus. A phylogenetic analysis, including new coding of A. krebsi, provide a result that is globally congruent with previous works, but differs significantly in the relationships of the gavialoids. A. krebsi is more closely related to G. gangeticus than is Eogavialis africanum. The South American Ikanogavialis gameroi and Gryposuchus colombianus form a polytomy, and are more closely related to G. gangeticus than is Piscogavialis jugaliperforatus, a gavialoid from Peru. The South American gavialoids may thus not be monophyletic. This result may indicate, contrary to previous result, a more complex paleobiogeographic history. Thus, a multiple invasion of South America by gavialoids from Africa is equally parsimonious with a single invasion, and an invasion from South American to Asia is equally parsimonious with an invasion from Africa.

Statistical analysis of ostracode population from sixty-eigth recent samples in the Huelva littoral (SW Spain) delimited six groups, according to number of individuals (total and live), adult/instar ratio and energy. Results were applied to twenty-nine Pliocene samples, with revision of some conclusions derived from the study of another fossil groups.

The site of Ahl al Oughlam has yielded the first important carnivore fauna of North Africa, and one of the richest of Africa. It includes 23 taxa, 13 of which are new, belonging to most of the carnivore families, mainly the Felidae (6 species), Hyaenidae and Mustelidae (4 species each). Several genera were not previously known from North Africa, like Pliocrocuta, Chasmaporthetes, Nyctereutes, Prepoecilogale, while the walrus (Alachtherium) is mentioned for the first time in Africa. Many other genera were unknown in the area earlier than the Middle or late Pleistocene: Herpestes, Viverra, Genetta, Acinonyx, Ursus, Poecilictis, Mellivora, Lutra. The carnivore fauna of Ahl al Oughlam, quite diverse ecologically, is at least as distinct from those of Eurasia as from those of Eastern and Southern Africa; the many similarities with both, however, allow to confirm the age previously proposed for the locality, ca. 2.5 m.y.

The oldest mammals of the Betic Cordillera are reported from the Marine-Lagoonal Formation of the internalPrebetic. Only four species were found: Blainvillimys cf. langei, Eucricetodon sp., ex group atavus, Eomys sp., and Gliravus sp. The fauna is dated as Early Oligocene. This age is in contradiction with the previously assumed Chattian age of the base of the Formation, based on benthonic foraminifera found in other localities.RésuméLes plus anciens mammifères des Cordillères Bétiques sont décrits de la Formation Marine-Lagunaire du PrébétiqueInterne. La faune ne comprend que quatre espèces: Blainvillimys cf. langei, Eucricetodon sp., ex group atavus, Eomys sp., et Gliravus sp. La faune est datée comme Oligocène Ancien. Cette datation est en contradiction avec l'âge Chattien supposé jusqu'à maintenant pour la partie basale de la Formation, à base de foraminifères benthoniques.

The paleozoic marine algae of Central Asia were recently investigated and attributed to warm-water and Tethyan microflora. If the majority of the taxa (114 out of 117) were already described from other basins, a few elements merit attention. Two chlorophyte species are new (Atractyliopsis nuratauensis nov. sp., Amarellina moscoviensis nov. sp.) and a new Hoeegonites sp. is left in open nomenclature. The flora also contains representatives of the puzzling Moniliporelleae, a rhodophyte family only reported from Kazakhstan with the genus Furcatoporella. An unusual in situ cluster of calcispheres is also illustrated.RésuméLa microflore d'algues marines calcaires du paléozoïque de l'Ouzbékistan a été illustrée pour la première fois et attribuée à des flores d'eaux chaudes ou téthysiennes (117 taxa sont reconnus). Si la grande majorité des espèces a été décrite dans d'autres bassins, certains éléments sont taxonomiquement intéressants. Deux espèces de Chlorophytes sont nouvelles (Atractyliopsis nuratauensis nov. sp. et Amarellina moscoviensis nov. sp.) ainsi qu'un représentant d'Hoeegonites sp. La flore comporte un représentant de l'énigmatique famille des Moniliporelleae (Rhodophyte, Furcatoporella). Enfin, une grappe in situ de Calcisphères est illustrée.

Unusual “coralligenous” build-ups were found at the infra–circalittoral boundary from SE Sicily. They are columnar, rising up perpendicularly from the bottom, and consist of an inter-growth of encrusting algae and invertebrates. A selected build-up and its longitudinal section, together with some thin sections of selected parts, were studied to detail the growth structures, composition and fabric of the trapped sediments. The coralline algae show a succession of “concentric”, “fruticulose” and “foliaceous” structures. The framework delineates cavities bounded by algal thalli, sometimes filled by sediments. The organisms constituting the framework were grouped into functional guilds (Fagerström, 1991): “primary frame builders” (mainly coralline algae); “secondary frame builders” (vermetids, serpulids and some bryozoans); “bafflers” (erect, flexible bryozoans, some sponges and soft algae); “binders” (encrusting bryozoans, some crustose coralline algae and serpulids); “destroyers” (a few endolithic algae, rare sponges and bivalves); “dwellers” (brachiopods, foraminifers, bivalves, small bryozoans and some motile organisms). The distribution pattern of taphonomic features (composition, grain size and distribution of sediments filling cavities; presence of cement and its location; mineralogical composition and crystal size), together with interactions between growth structures and functional guilds, allowed one to distinguish three taphofacies, each recording different environmental conditions. They have been tentatively related with cyclic sequences testifying to local hydrodynamic regimes, with subsequent slighter and stronger intensity phases, during the last 2200 years.

Fossil mammals remains from a newly discovered Miocene locality in the northern Sahara are described. Thislocality is situated to the North of Tademaït and is the most southerly located site of Miocene age in North Africa. The fauna includes a new Amphicyonine carnivore (Miacyon dojambir nov. gen. nov. sp.), two perissodactyls (Hipparion primigenium von Meyer, 1827 and Aceratherium sp.), an artiodactyl Palaeotraginae (Palaeotragus cf. germainiArambourg, 1959), and a proboscidea (Proboscidea indet.). The most abundant remains can be attributed to the two perissodactyls, while the other taxa are each represented by only single specimens. The presence of a primitive hipparionian-type Hipparion, the fact that Aceratherium is of small size, and the occurrence of an amphicyonine are the main arguments used in attributing the age of this locality to the Vallesian.

En este trabajo se describe un nuevo basicráneo de titanosaurio (MML-194), en perfecto estado de preservación, proveniente del Cretácico Superior (Campaniano medio - Maastrichtiano inferior) de Río Negro, Argentina. Dentro de Titanosauria, el ejemplar recuerda a Bonatitan reigi más que a cualquier otro miembro del clado, en la presencia de una protuberancia supraoccipital recorrida por un surco medial (también presente en Saltasaurus y Rapetosaurus), las toberas basales prominentes, el foramen de salida para el nervio VII sobre la cresta proótica, el cóndilo occipital y el foramen magnum aproximadamente del mismo ancho. El material permite ver ciertas estructuras internas que no son apreciables en otros ejemplares de Titanosauria, como la cavidad pituitaria, la dorsum sellae, y los forámenes para la entrada de las carótidas internas. El material estudiado y Bonatitan fueron exhumados de un mismo nivel estratigráfico, la Formación Allen, de la cual también han sido colectados huevos fósiles asignables a saurópodos (megaloolitos), por lo que no es improbable que alguno de estos dos taxones haya sido el responsable de su puesta.

This is the first description of Pliensbachian (Carixian and mainly Domerian) ammonite faunas from southern Turkey (Lycian Allochton, western Taurus). These faunas are from the Kısılka-Çorak unit (Kızılca locality, Tavas area) and from the Gümüslü unit (Ayıburnu Tepe and Kuru Dag localities). They consist of 32 species characterising seven biostratigraphic levels. Two new Carixian species are described: Lytoceras kisilcus nov. sp. and Fuciniceras lycius nov. sp. These Lycian faunas chiefly include Juraphyllitidae, Lytoceratoidea, Dactylioceratidae and Hildoceratidae. Conversely, Phylloceratidae are rather scarce. The faunas form a homogeneous assemblage of Mediterranean taxa clearly indicative of a South Tethyan paleobiogeographic affinity. The palaeobiogeographical analysis suggests for the Lycian Pliensbachian deposits a single area of sedimentation protected from oceanic influences by neritic barriers, possibly a basin between the Menderes and the Bey Dagları neritic platforms.

A diverse avifauna is described from the lowermost Oligocene (MP 21) of the locality Boutersem near Bruxelles, Belgium. Remains of at least 13 avian taxa were distinguished and many are represented by more than one skeletal element. Coracoids of two anseriform taxa were identified, one of these is tentatively assigned to Paracygnopterus HARRISON and WALKER, 1979, the other is tentatively referred to Romainvillia LEBEDINSKY, 1927. Other anseriform bones are described but could not be assigned to one of the coracoids. The specimen referred to Paracygnopterus is the earliest certain record of the Anatidae and confirms the presence of this family in the lowermost Oligocene of Western Europe. Charadriiform birds are represented by at least four different species. Two of these are assigned to the new genus Boutersemia (Boutersemia belgica nov. gen. nov. sp., Boutersemia parvula nov. gen. nov. sp.). The genus Boutersemia is characterized by a large foramen vasculare distale on the tarsometatarsus and is tentatively assigned to the Glareolidae. Three species of rails (Gruiformes, Rallidae) were identified, two of which are classified in the new genus Belgirallus (Belgirallus oligocaenus nov. gen. nov. sp., Belgirallus minutus nov. gen. nov. sp.). The species of the genus Belgirallus are among the earliest substantial record of fossil Rallidae, and Belgirallus minutus is the smallest early Tertiary rail known so far. A fragmentary distal end of a tarsometatarsus has been assigned to the Pici and represents the earliest fossil record of this taxon. A distal end of an upper beak resembles that of recent Scolopacidae and Rostratulidae (Charadriiformes), but is much larger. Fragmentary tarsometatarsi of two large avian taxa probably belong to the Idiornithidae (Gruiformes) and Phoenicopteriformes.

The discovery, in Antarctic rocks of the Middle Triassic, of leaves with Dicroidium anatomy attached to stems withundivided vascular cylinder and pycnoxylic wood of the widespread Dadoxylon type, calls into question the long-accepted reconstruction of Dicroidium fronds attached to Rhexoxylon stems. Although Dicroidium leaves are common throughout Gondwana, Rhexoxylon is known only from Western Gondwana (Argentina, Brazil and South Africa). The anatomy of the Antarctic axes, including the presence of numerous buds, suggests a plant with more complex architecture than that proposed in the reconstruction of Dicroidium in Western Gondwana. Two hypotheses for the belated discovery of this additional “Dicroidium plant” are proposed.RésuméLa découverte dans un gisement du Trias moyen d'Antarctique de feuilles à anatomie de Dicroidium attachées à des 0309 tiges qui présentent un cylindre vasculaire non divisé et du bois pycnoxylique de type Dadoxylon remet en question l'hypothèse classique selon laquelle les frondes de Dicroidium étaient portées par des axes de Rhexoxylon. Alors que les feuilles de Dicroidium sont largement représentées dans l'ensemble du Gondwana, Rhexoxylon est restreint à la partie ouest du continent (Argentine, Brésil et Afrique du Sud). L'anatomie des axes d'Antarctique, qui présentent en particulier de nombreux bourgeons, suggère que l'architecture de ces plantes était plus complexe que celle proposée pour la reconstruction de Dicroidium basée sur les restes du Gondwana de l'Ouest. Deux hypothèses sont proposées pour interpréter la découverte récente de cette nouvelle plante à frondes de Dicroidium.

Newly discovered fossil localities in coarse-grained deposits of the Pennsylvanian and Permian Antler overlap assemblage in the southern Shoshone Range, north-central Nevada have yielded a low-diversity assemblage consisting chiefly of a new species of chonetoidean brachiopod: Dyoros (Lissosia) nevadaensis nov. sp. The subgenus Dyoros (Lissosia), is known from Leonardian and lower Guadalupian strata in North America, mainly in Texas. The coarse-grained lithology of the host strata, their unconformable relation on deformed lower Paleozoic rocks, and the Leonardian and(or) lower Guadalupian age indicated by Dyoros (Lissosia) provide evidence that host strata are younger than strata of the Antler overlap assemblage in nearby areas of the southern Shoshone Range and suggest that an unconformity of local extent may be present within the overlap assemblage. The fossil age ranges and lithologic data suggest that the host strata may be correlative with the Guadalupian Edna Mountain Formation, an unconformity-bounded unit that forms the upper part of the Antler sequence in the Battle Mountain area to the north. This correlation suggests that the unconformity beneath these strata may have regional extent in north-central Nevada. The origin of the inferred regional unconformity is unknown and may have resulted from relative changes of sea level or regional extensional or contractional tectonism in the area of the former Antler highlands, which forms the substrate for the Antler overlap assemblage.

An abundant fauna of Scleractinian corals has been studied from a Mid Miocene (Serravallian) newoutcrop in the North Aquitaine Basin (SW France). It consists of more than fifteen taxa, with a noticeable diversification in the genera Flabellum and Balanophyllia; 10 of these taxa are new in the Miocene of the Aquitaine Basin. This is probably the richest assemblage of the French Serravallian. The name Flabellum montanaroae nov. nom. is set. Biogeographically, the studied locality bears witness to Northern, Atlantic and Mediterranean influences. The ahermatypic content of the fauna agrees with the observed general trends to a gradual disappearance of reefal species and to a cooling in neritic waters during the Mid Miocene along the Northeastern Atlantic frontage. In terms of paleoecology, the corals-rich deposit contains an abundant malacofauna, which indicates an infralittoral, euhaline, and fairly calm environment, with a marly-sandy substrate; this biofacies looks like the muddy facies of the modern assemblage SFBC (“Sables Fins Bien Calibrés”).

Subfossil bird bones collected at two sites on Madagascar include specimens of two species of Aquila eagles, agenus previously unknown on Madagascar. It is not possible to determine if these specimens represent extinct or extirpated species.RésuméL'étude d'ossements d'oiseaux sub-fossiles provenant de deux localités de Madagascar a permis de mettre enévidence la présence des restes de deux espèces d'aigle appartenant au genre Aquila, genre jusqu'alors inconnu de Madagascar. Il n'est pas possible de définir si ces espèces du genre Aquila représentent des espèces aujourd'hui éteintes ou constituent des espèces dont la distribution actuelle ne comprend plus Madagascar.

This paper deals with the detailed taxonomic study of the first mammal remains from the Marinio Formation in the Divisadero Largo area, Mendoza, central west Argentina. This area was well-known by the fossils recovered from the Triassic levels and particularly by the faunal assemblage from the Cenozoic levels corresponding to the Divisadero Largo Formation. Until recently, no mammal remains had been accurately reported for the Marinio Formation, Miocene in age. The specimen consists in an almost complete upper jugal series (teeth found separated from the maxillary bone except the M3) of a small Mesotheriidae (Notoungulata), which was preliminary identified as Mesotheriinae indet. The main characteristic of these teeth is their small size, significatively lesser than that of the Miocene genera Eu ypotherium, Typotheriopsis and Pseudotypotherium, being closer to Alycrotypotherium from Bolivia and the Chilean species from the Chucal Formation. The direct comparison with these latter forms has allowed a more detailed Study and the recognition of the material here described as cf. Altiopotherium chucalensis, with all cautions inherent to the incompleteness of the material. (c) 2007 Elsevier Masson SAS. All rights reserved.

The composition of Jurassic marine ostracod and foraminiferal assemblages from the Neuquen Basin is analysed. The absence of these microfossils from certain levels is attributed to a number of causes, such as inimical facies for their existence or for their preservation. Evidence is produced demonstrating that the absence of ostracods and the virtual absence of Foraminifera from such important Middle Jurassic sections as that at Chacay Melehue is due to their lower bathyal or abyssal palaeodepth. The relative success of filter and deposit feeders is shown to be probably related to palaeoxygen levels, with filter feeders being able to tolerate lower levels of oxygen concentration than their competitors. The palaeoecology of the various ostracod assemblages is compared and contrasted with that of their contemporary Foraminifera. While in the Liassic and the early Middle Jurassic there is a considerable general similarity between ostracod assemblages wordwide, throughout the remainder of the Jurassic there is evidence of the progressive isolation of southern South America, with consequent generic impoverishment and the absence or extreme rarity of many of the major families and genera of NW Europe. Conversely, there are no genera or supra-generic taxa endemic to Argentina.

Six new species of deep-sea cytheracean Ostracoda are described from the southwestern Pacific and eastern IndianOceans. The new species are Abyssobythere inequivalva, Cytheropteron anisovalva, C. dorsocorrugatum, C. lumalatum, C. parapulcinella and C. lobatulum. These species possess a hollow expansion of the shell above the hinge, forming a linear keel in all except in the latter species which has a laterally drooping dorsal lobe. We observe in some species that there is internal communication between the dorsal keel space and the interior of the duplicature. This suggests that the space has a particular function; various possible advantages inherent in the possession of such structures, including controlled buoyancy, are discussed.RésuméSix nouvelles espèces d'ostracodes marins profonds de la famille Cytheracea sont décrits. Ils proviennent du Sud-OuestPacifique et de l'Océan Indien oriental. Ces nouvelles espèces sont: Abyssobythere inequivalva, Cytheropteron anisovalva, C. dorsocorrugatum, C. lumalatum, C. parapulcinella et C. lobatulum. Elles possèdent toutes un prolongement creux de la coquille au-dessus de la charnière, qui forme un aileron, sauf chez la dernière espèce ou l'exroissance prend la forme d'un lobe qui pend latéralement. Nous avons observé chez certaines espèces une communication entre l'intérieur de l'aileron et la zone marginale interne, suggérant une fonction particulière pour cette structure. Les différents avantages liés à la possession d'une telle excroissance, en particulier au niveau de la flottabilité, sont discutés.

Detailed micropaleontological investigations carried out over several decades by one of us (M.-F. P.) mainly in central and western Pyrenees (Bigorre, Béarn, Pays Basque) resulted in a subdivision of the Pyrenean Carboniferous into twelve conodont zones. An attempt is made herewith to compare and correlate this zonation with several equivalent subdivisions established throughout the world (Cantabric Mountains, North Africa, British Isles, Belgium, Germany and Central Europe, Donetz Basin, South China, and the USA).

A new species of corvid assigned to genus Pica is described from Pedrera de s'Ónix (Mallorca), a fossil site referred to the Plio-Pleistocene boundary. The combination of osteological features in the fossil species is not fully coincident with any Palearctic Corvidae; the major resemblance is with Pica pica and to a lesser extend with Garrulus glandarius. Automorphic characters are present in the humerus, femur and quadrate. The generic attribution is based on the latter bone. A reduction of the wing elements and a lengthening of the leg is present in the fossil species, probably achieved through insular evolution. Ratios estimating relative proportions of wing and leg skeleton prove reduction in flight capability compared to recent Corvidae, although the trend is not as extreme as in the insular Traversia lyalli (Acanthisittidae) or Emberiza alcoveri (Emberizidae), the only truly flightless passerines known so far.

The discovery of continental interstratified fossiliferous layers within the lower Miocene marine deposits of Bas Languedoc and the rather unexpected occurrence of rodents within the marine deposits of the same period enables us to refine the mammalian biochronological scale, but above all enables us to establish correlations between the latter and the marine stratigraphic scale. Thus the standard mammalian level of Paulhiac is correlated to the «formation bioclastique de Carry-le-Rouet. As for the standard level of Laugnac it might correspond to the marine Burdigalian whereas it is traditionally allocated to the Aquitanian.The abundance of rodents has allowed to complete our knowledge of still imperfectly known faunas and to formulate new data concerning some evolutive lineages of Cricetid, Eomyid and Glirid rodents.

When studying the biology and ecology of Juliidaeliving representatives (Gastropoda, Opisthobranchia, Sacoglossa) a close relationship can be observed between these animals and green Algae of the genus Caulerpa (Chlorophycea, Siphonophycidae). The animal feeds on the host plant by sucking the sap of the Alga, and moreover seems to use the ingested chloroplasts for a functional photosynthesis. Each species of Juliidae is found living on only one (or sometimes two) species of Caulerpa.The fossil Juliidae prove the existence of Caulerpagrowing at the same places, though these algae do not leave any direct remnant of their presence. Applying this to the Paris Basin Eocene, where the Juliidae are relatively abundant and varied, a quite accurate estimate is given for many characteristics of the paleo-environment, by analogy with the narrow and strict ecological needs of the living representatives (bathymetry, temperature and oxygenation of water, and presence of Caulerpa sea weeds).A review of the Paris Basin eocene species is given, including their stratigraphical distribution and drawings of the shells.